This wasn't the first time I had heard of the Dyatlov pass incident, but I didn't know much so I was very interested to read this book. And it was a really great book! Well-researched, well-written. Not too long so I was able to read it quickly. Also liked having all of the pictures to connect me with the story.
Goes through multiple theories and what makes some more improbably than others. The theory that he lands on of why the hikers abandoned their tent that night makes complete sense to me (I won't spoil it).